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Customer Training Material

or s op

S mmetric vs. As mmetric

Structural Nonlinearities

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Customer Training MaterialWorkshop 3B: Symmetric vs. Asymmetric

Goal

Use contact to predict pressure profile at

spherical interface between ball and socket.

Compare and contrast Symmetric Vs.

Asymmetric Contact behavior.

2D Axisymmetric model of ball and socket joint

Materials:

Contact between parts:

One frictional region on spherical interface

Ball

.

Loads & Boundary Conditions:

Socket is fixed at the top

Ball has a 1000N force a lied to it in vertical -Y

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direction

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ANSYS Mechanical Structural Nonlinearities

Customer Training Material Workshop 3B: Symmetric vs. Asymmetric

Steps to Follow:

Restore Archive browse for file W3b-Socket.wbpz

Save as

File name: W3b-Socket

*

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ANSYS Mechanical Structural Nonlinearities

Customer Training Material Workshop 3B: Symmetric vs. Asymmetrice ro ec c ema c s ou oo e e p c ure e ow.

Note: The engineering data, geometry, loads and boundary conditionsand preliminary contact region have already been set up. It remains toredefine the contact behavior and compare and contrast contact results.

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ANSYS Mechanical Structural Nonlinearities

Customer Training Material Workshop 3B: Symmetric vs. Asymmetric

Highlight the Engineering Data Cells double

click to open and verify the predefined material

properties

, ,

system. If not, fix this by clicking on Utility Menu>Units>Metric(Tonne, mm,..)

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ANSYS Mechanical Structural Nonlinearities

Customer Training Material Workshop 3B: Symmetric vs. Asymmetric

Return to the project schematic page

Double click (or RMB=>Edit) on the Model Cell to open Mechanical

Session

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ANSYS Mechanical Structural Nonlinearities

Customer Training Material Workshop 3B: Symmetric vs. Asymmetric

Once inside the Mechanical application, verify the working unit system

Unit > Metric (mm,kg,N,s,mV,mA)

Expand each folder in the project tree to become familiar with the

. , ,

loads as described on the slide 2.

modify the specifications as follows:

Type = Frictional = .

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ANSYS Mechanical Structural Nonlinearities

Customer Training Material Workshop 3B: Symmetric vs. Asymmetric

Highlight the Analysis Settings Folder:

Turn Large Deflection ON

Take default settings for everything else

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ANSYS Mechanical Structural Nonlinearities

Customer Training Material Workshop 3B: Symmetric vs. Asymmetric

Execute a Solve:

Highlight the Solution Information

branch and note the following

from the Solver output:

ecause o e . r c on

coefficient, autotime stepping

starts with 5 substeps.

Turning on large deflection will

ensure stress stiffening effects

are included

From the Force Conver ence

Graph, the solution convergeseasily

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ANSYS Mechanical Structural Nonlinearities

Customer Training Material Workshop 3B: Symmetric vs. Asymmetric

Post Process Total Deformation and Equivalent Stress

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ANSYS Mechanical Structural Nonlinearities

Customer Training Material Workshop 3B: Symmetric vs. Asymmetric

g g e o u on ranc

RMB > Insert > Contact Tool

Hi hli ht the newl inserted

Contact Tool

RMB > Insert >

Pressure

ene ra on

RMB > Evaluate Results

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ANSYS Mechanical Structural Nonlinearities

Customer Training Material Workshop 3B: Symmetric vs. Asymmetric eca , s s a symme r c con ac reg on. ence, ere are con ac resu s

available on both the contact and target sides.

Using the Contact Tool, compare and contrast the contact results (status,

,

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ANSYS Mechanical Structural Nonlinearities

Customer Training Material Workshop 3B: Symmetric vs. Asymmetric

Note the differences between the contact and target pressureprofiles.

Which one is correct?

Tar et Side Onl

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Answer: Neither. The correct answer is an average of the two profiles.

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ANSYS Mechanical Structural Nonlinearities

Customer Training Material Workshop 3B: Symmetric vs. Asymmetric

Return to the Connection Folder.

Highlight the frictional contact region

Change Behavior to Asymmetric

Rerun the solution

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ANSYS Mechanical Structural Nonlinearities

Customer Training Material Workshop 3B: Symmetric vs. Asymmetric

Post process the contact results as before. Note that there is now only one

answer (on the contact side) and it is an approximate average of the two

results that were available with the symmetric contact.

. . .

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Contact Side Only Target Side Only

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ANSYS Mechanical Structural Nonlinearities

Customer Training Material Workshop 3B: Symmetric vs. Asymmetric

Note that regardless of which contact behavior is used (Symmetric or

Asymmetric) in this example, the overall model results for deformation and

equivalent stress remain essentially the same. Symmetric behavior is

.

be more challenging to interpret.

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